Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective mathematics, physics Of a
four-vector in representing apoint inspacetime , having apositive four-vector norm. - adjective physics (of the interval between two events in spacetime) Having overlapping
light cones , so thatinformation can pass from one to the other, and one can be envisaged as acause of the other.
Etymologies
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Examples
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Now, in an open or flat Friedmann-Robertson-Walker cosmological model with no cosmological constant, whilst the past 'Big-Bang' singularity corresponds to a spacelike hypersurface in the boundary of the conformal compactification, the future timelike infinity corresponds to a single point.
Archive 2009-05-01 Gordon McCabe 2009
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The far future of our universe is therefore representable by de Sitter space-time, and in this type of space-time the future timelike boundary is a spacelike hypersurface.
Archive 2009-05-01 Gordon McCabe 2009
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The boundary of the conformal compactification contains components which correspond to singularities, and components which correspond to spacelike infinity, timelike infinity, (and null infinity).
Archive 2009-05-01 Gordon McCabe 2009
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And Frank Tipler, in his youth, did some pioneering research on closed timelike curves in general relativity, so he has credentials as an honest physicist.
Accusations and Assumptions: Another Mythicist-Creationist Parallel James F. McGrath 2010
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The result is a nonzero interval, spacelike for two photons emitted simultaneously from a source and timelike between different points on the worldline of a photon bouncing between mirrors.
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The math is almost identical to my example, except that you get a timelike interval instead of a spacelike one.
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The interval is zero between two points within a single lap, but it is nonzero (and timelike) when you take points on two different laps.
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But there are soulutions that allow 'closed timelike curves' - travel backwards in time, at least back to a defined origin.
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The math is almost identical to my example, except that you get a timelike interval instead of a spacelike one.
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The interval is zero between two points within a single lap, but it is nonzero (and timelike) when you take points on two different laps.
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